It’s an ancient rule and a wise one, but one that does not do justice to the life and career of Andrew Breitbart, dead today aged 43.

It is impossible to speak nothing of a man who traced such a spectacular course through the contemporary media.

But to speak only “good” of Andrew Breitbart would be to miss the story and indeed to misunderstand the man.

The good was there. Breitbart was by all accounts generous with time and advice, a loving husband and father, and a loyal friend. One of those friends, Arianna Huffington, wrote today: “All I can think is what Andrew meant to me as a friend … his passion, his exuberance, his fearlessness." Breitbart was unquestionably passionate and was exuberant.

If by “fearless” you mean perpetually eager for confrontation, then yes he was fearless too, although in a very particular way. Nobody would ever describe Andrew Breitbart as a man of “quiet courage.” He delighted in the enraged outburst, the shouted insult, the videotaped jab of a finger into an opponent’s chest.

Andrew Breitbart was an innovator and inventor, a man who as much as any shaped the media culture of the Internet age. He was present at the creation of the Drudge Report, the Huffington Post, and of course his own popular sites.

Yet perhaps Breitbart’s most consequential innovation was his invention of a new kind of culture war. Until recently, the phrase “culture war” mainly described the political struggle over religion and sexuality. When Pat Buchanan declared a “culture war” from the rostrum of the Republican convention in 1992, he specifically cited abortion, gay rights, pornography, prayer in schools, and women in combat as the outstanding issues.

Those were not the issues that much interested Andrew Breitbart. On gay rights, he held almost the polar opposite view of Buchanan’s in 1992.

In fact, it’s hard even to use the word “issues” in connection with Andrew Breitbart. He may have used the words “left” and “right,” but it’s hard to imagine what he ever meant by those words. He waged a culture war minus the “culture,” as a pure struggle between personalities. Hence his intense focus on President Obama: only by hating a particular political man could Breitbart bring any order to his fundamentally apolitical emotions.

Because President Obama was black, and because Breitbart believed in using every and any weapon at hand, Breitbart’s politics did inevitably become racially coded. Breitbart’s memory will always be linked to his defamation of Shirley Sherrod and his attempt to make a national scandal out of back payments to black farmers: the story he always called “Pigford” with self-conscious resonance.

Yet it is wrong to see Breitbart as racially motivated. Had Breitbart decided he hated a politician whose ancestors came over on the Mayflower, Breitbart would have been just as delighted to attack that politician with a different set of codes. The attack was everything, the details nothing.

This indifference to detail suffused all of Breitbart’s work, and may indeed be his most important and lasting legacy. Breitbart sometimes got stories right (Anthony Weiner). More often he got them wrong (Sherrod). He did not much care either way. Just as all is fair in a shooting war, so manipulation and deception are legitimate tools in a culture war. Breitbart used those tools without qualm or regret, and he inspired a cohort of young conservative journalists to do likewise.

In time, Andrew Breitbart might have aged into greater self-control and a higher concept of public service. Premature death deprived him of the chance at redemption often sought and sometimes found by people who have done wrong in their lives and work.

And this is where it becomes difficult to honor the Roman injunction to speak no ill of the dead. It’s difficult for me to assess Breitbart’s impact upon American media and American politics as anything other than poisonous. When one of the leading media figures of the day achieves his success by his giddy disdain for truth and fairness—when one of our leading political figures offers to his admirers a politics inflamed by rage and devoid of ideas—how to withhold a profoundly negative judgment on his life and career?

Especially when that career was so representative of his times?

We live in a time of political and media demagoguery unparalleled since the 19th century. Many of our most important public figures have gained their influence and power by inciting and exploiting the ugliest of passions—by manipulating fears and prejudices—by serving up falsehoods as reported truth. In time these figures will one by one die. What are we to say of this cohort, this group, this generation? That their mothers loved them? That their families are bereaved? That their fans admired them and their employees treated generously by them? Public figures are inescapably judged by their public actions. When those public actions are poisonous, the obituary cannot be pleasant reading.

David Frum is a contributing editor at Newsweek and The Daily Beast and a CNN contributor.

I think Mr. Frum has just illustrated the point I have been trying to get across. He acknowledges that by speaking only good of Andrew Brietbart would be to dismiss part of the man. He goes on to speak both good and bad, but never does he descend into the vitriolic and disrespectful.